Save Camera Calibration Parameters

Question

Erin 2014-3-13

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评论： Aditi Singh 2019-10-8

The export of camera parameters from the Camera Calibration toolbox creates its own type of variable that cannot be saved as a .mat. How can I save these so that I can load it when I want to use that camera instead of calibrating it every time? Is xml the only way?

Thanks, Erin

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Clive Fox 2016-10-27

编辑：Clive Fox 2016-10-27

There is a command toStruct(cameraParams) which seems to work,so if you have created a cameraParameters object in your workspace

mycamParams = toStruct(cameraParams)

save mycamParams.mat mycamParams %Saves as a mat file

clear %clear variables in workspace

load('mycamParams.mat') %loads it back in and Matlab recognises it is a structure

mycamParams=cameraParameters(parameterStruct) % recreates the camera parameters object which you can then use to undistort images etc.

Aditi Singh 2019-10-8

I have an image how can I find camera calibration for that.

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Answer 1

Dima Lisin 2014-5-1

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编辑：Dima Lisin 2014-5-1

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You certainly can save the camera parameters object into a mat file, just like any other variable. Export the variable to workspace. Let's call it myParams. Then do

>> save myParams.mat myParams

That should work.

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Helia Sh 2018-12-12

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I kept getting an error: ""Argument must contain a character vector". I slightly modified Dima's suggestion to make it work for me:

>> save 'myParams' myParams

Matt J 2018-12-12

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Hard to see why the modification was necessary or made any difference. Maybe you were originally using the functional form of save as follows,

save('myParams',myParams)

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Answer 2

Sean de Wolski 2014-3-13

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With MATLAB R2014a, you can generate equivalent code with the app.

http://www.mathworks.com/help/releases/R2014a/vision/release-notes.html

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Image Analyst 2014-3-13

You can probably get a free upgrade if you purchased R2013b.

Erin 2014-3-13

It's a company license so I can't.

Basically I am trying to save the object of the type vision.CameraParameters class. I would like to be able to save it out of my workspace so that I can just reload it to use it for undistortImage instead of rerunning the calibration each time my workspace gets cleared.

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Answer 3

Matt J 2014-3-13

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编辑：Matt J 2014-3-13

在 MATLAB Online 中打开

You could write a customized save routine that exports the CameraParameters properties and saves them in a structure

function save_cameraParams(cpObject,fileName)
    fields={'IntrinsicMatrix', 'RadialDistortion',etc...}
    for ii=1:length(fields)
      S.(fields{ii})=cpObject.(fields{ii});
    end
    save(fileName, 'S');
end

Then a similar one to reload and rebuild the vision.CameraParameters object,

   function cpObject=load_cameraParams(fileName)
     S=load(fileName); S=S.S
     pairs=[fieldnames(S), struct2cell(S)].';
     cpObject=vision.CameraParameters(pairs{:});
   end